High severity · published Sep 14, 2026
CVE-2026-78336
Apache Syncope: OIDCC4UI provider list discloses client secrets to any authenticated user
7.5
CVSS
0.4%
EPSS
No
On KEV
Description
Insertion of sensitive information into sent data vulnerability in Apache Syncope.
Any authenticated user can query for the list of available OIDC providers configured for SSO with Console and Enduser. The returned payload contains all configuration settings, including client secrets, regardless of the entitlements owned by the caller.
This issue affects Apache Syncope: from 3.0.0-M0 through 3.0.16, from 4.0.0-M0 through 4.0.7, from 4.1.0-M0 through 4.1.2.
Users are recommended to upgrade to version 4.0.8 / 4.1.3, which fix this issue.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 37% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AS
Apache Syncope · Apache Software Foundation
3.0.0-M0 through 3.0.16; 4.0.0-M0 through 4.0.7; 4.1.0-M0 through 4.1.2 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-78336
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-78336
lists.apache.org
https://lists.apache.org/thread/h399sqmf4wgnfxxpd6x9lm3m672rrsjt
www.openwall.com
http://www.openwall.com/lists/oss-security/2026/09/14/20
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